Show better error message if data dir can't be created

chrome/content/zotero/xpcom/dataDirectory.js

@@ -338,7 +338,75 @@ Zotero.DataDirectory = {
 		}
 		
 		Zotero.debug("Using data directory " + dataDir);
-		yield Zotero.File.createDirectoryIfMissingAsync(dataDir);
+		try {
+			yield Zotero.File.createDirectoryIfMissingAsync(dataDir);
+		}
+		catch (e) {
+			if (e instanceof OS.File.Error
+					&& (('unixErrno' in e && e.unixErrno == OS.Constants.libc.EACCES)
+						|| ('winLastError' in e && e.winLastError == OS.Constants.Win.ERROR_ACCESS_DENIED))) {
+				Zotero.restarting = true;
+				let isDefaultDir = dataDir == Zotero.DataDirectory.defaultDir;
+				let ps = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
+					.createInstance(Components.interfaces.nsIPromptService);
+				let buttonFlags = ps.BUTTON_POS_0 * ps.BUTTON_TITLE_IS_STRING
+					+ ps.BUTTON_POS_1 * ps.BUTTON_TITLE_IS_STRING;
+				if (!isDefaultDir) {
+					buttonFlags += ps.BUTTON_POS_2 * ps.BUTTON_TITLE_IS_STRING;
+				}
+				let title = Zotero.getString('general.accessDenied');
+				let msg = Zotero.getString('dataDir.dirCannotBeCreated', [Zotero.appName, dataDir])
+					+ "\n\n"
+					+ Zotero.getString('dataDir.checkDirWriteAccess', Zotero.appName);
+				
+				let index;
+				if (isDefaultDir) {
+					index = ps.confirmEx(null,
+						title,
+						msg,
+						buttonFlags,
+						Zotero.getString('dataDir.chooseNewDataDirectory'),
+						Zotero.getString('general.quit'),
+						null, null, {}
+					);
+					if (index == 0) {
+						let changed = yield Zotero.DataDirectory.choose(true);
+						if (!changed) {
+							Zotero.Utilities.Internal.quit();
+						}
+					}
+					else if (index == 1) {
+						Zotero.Utilities.Internal.quit();
+					}
+				}
+				else {
+					index = ps.confirmEx(null,
+						title,
+						msg,
+						buttonFlags,
+						Zotero.getString('dataDir.useDefaultLocation'),
+						Zotero.getString('general.quit'),
+						Zotero.getString('dataDir.chooseNewDataDirectory'),
+						null, {}
+					);
+					if (index == 0) {
+						Zotero.DataDirectory.set(Zotero.DataDirectory.defaultDir);
+						Zotero.Utilities.Internal.quit(true);
+					}
+					else if (index == 1) {
+						Zotero.Utilities.Internal.quit();
+					}
+					else if (index == 2) {
+						let changed = yield Zotero.DataDirectory.choose(true);
+						if (!changed) {
+							Zotero.Utilities.Internal.quit();
+							return;
+						}
+					}
+				}
+				return;
+			}
+		}
 		this._cache(dataDir);
 	}),
 	

chrome/content/zotero/xpcom/zotero.js

@@ -29,6 +29,9 @@ Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
 Components.utils.import("resource://gre/modules/Services.jsm");
 Components.utils.import("resource://gre/modules/osfile.jsm");
 Components.utils.import("resource://gre/modules/PluralForm.jsm");
+Components.classes["@mozilla.org/net/osfileconstantsservice;1"]
+	.getService(Components.interfaces.nsIOSFileConstantsService)
+	.init();
 
 Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 
@@ -288,6 +291,9 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 		
 		try {
 			yield Zotero.DataDirectory.init();
+			if (this.restarting) {
+				return;
+			}
 			var dataDir = Zotero.DataDirectory.dir;
 		}
 		catch (e) {

chrome/locale/en-US/zotero/zotero.properties

@@ -119,6 +119,8 @@ attachmentBasePath.clearBasePath.existingAttachments.singular  = One existing at
 attachmentBasePath.clearBasePath.existingAttachments.plural    = %S existing attachments within the old base directory will be converted to use absolute paths.
 attachmentBasePath.clearBasePath.button                        = Clear Base Directory Setting
 
+dataDir.dirCannotBeCreated           = The %S data directory (%S) cannot be created.
+dataDir.checkDirWriteAccess          = Make sure you have write access to this directory and that security software isn’t preventing %S from writing to the disk.
 dataDir.databaseCannotBeOpened       = The %S database cannot be opened.
 dataDir.checkPermissions             = Make sure you have read and write permissions for all files in the %1$S data directory and that security software isn’t preventing %1$S from accessing that directory.
 dataDir.moveToDefaultLocation        = You may be able to fix this problem by moving the data directory to the new default location in your home directory. %S will automatically detect the new location.